THREE RIVERS, MI

Overview:
Three Rivers is located in the southeastern part of Michigan’s Lower Peninsula. The city is located at the confluence of three different rivers: the St. Joseph River, the Rocky River, and the Portage River. Its location inland on the Lower Peninsula leads to larger observed temperature variations than locations closer to the lakes.

Precipitation in Three Rivers is evenly distributed throughout the year, with slight maximums coming in the late summer and early fall months. Heavy precipitation events in the area have become more frequent in recent decades. Temperatures in Three Rivers rarely exceed 90°F in the summer.

State/ Province ID: MI

Station ID: C00208184

Directory Name: THREE_RIVERS__MI_C00208184

Elevation: 246.90m

The resources presented here were developed in cooperation with the Office of the Michigan State Climatologist using data from the National Centers for Environmental Information. For more information regarding our data sources, quality control, and methodology, please see our Historical Climatologies: Quality Control reference guide.

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Recent Climate Summary, 1991-2020


Average Temperature	49.0°F9.4°C
Average Low Temperature	38.5°F3.6°C
Average High Temperature	59.4°15.2°C
Days/Year that exceed 90°F	8.1
Days/Year that fall below 32°F	133.6
Lowest Annual Average Temperature	45.5°F7.5°C
Highest Annual Average Temperature	51.6°F10.9°C
Average Annual Total Precipitation	39.7 in100.9 cm
Lowest Annual Precipitation Total	31.2 in79.3 cm
Highest Annual Precipitation Total	51.8 in131.7 cm
Days/Year that exceed 1.25" of Precipitation	5.5

Temperature

Click on the following links to be taken to the corresponding portion of the page.

Monthly Average Temperature
How Temperatures are Changing
- Changes in Average Temperature – Includes a summary table of the average annual and seasonal temperature changes, and time series graphs of how the annual low, average, and high temperatures compare to the long term average plotted for every year on record.
- Cold Temperatures – View time series plots of the number of days per year below 32°F and the number of heating degree days per year to see how cold days are changing.
- Hot Temperatures – View time series plots of the number of days per year above 90°F and the number of cooling degree days per year to see how hot days are changing.
- Growing Season Changes – View a time series of the annual number of days in the freeze-free period.

Monthly Average Temperature

Changes in Average Temperature, 1951-2025.


	°F°C
Annual average temperature	0.50.3
Winter average temperature	1.81.0
Spring average temperature	-0.1-0.1
Summer average temperature	0.00.0
Fall average temperature	0.10.1

Annual High and Low Temperature Departure

Cold Temperatures

¹Heating Degree Days (HDDs) are indexed units, not actual days, that roughly describe the demand to heat a building. HDDs accumulate on days colder than 65°F when heating is required. Every degree below 65°F is added to the annual total for an annual HDD value, which is plotted in the figure.

Hot Temperatures

²Cooling Degree Days (CDDs) are indexed units, not actual days, that roughly describe the demand to cool a building. CDDs accumulate on days warmer than 65°F when cooling is required. Every degree above 65°F is added to the annual total for an annual CDD value, which is plotted in the figure.

Growing Season Changes

Precipitation